Year
1999
Abstract
Acceptance of nuclear materials into a monitoring regime, such as one administered by the IAEA under the Trilateral Initiative, is complicated if the materials are in classified shapes or have classified composition. An “information barrier” can be employed to separate classified measurements and data from a totally unclassified display that is visible to the inspectors. An Inspection System with Information Barrier has been designed, constructed, and tested for the Trilateral Initiative. Under this initiative, plutonium presence and threshold values of plutonium mass and isotopic composition are the desired unclassified outputs. These outputs are derived from classified gamma and neutron measurements on the nuclear material. The information barrier described in this paper separates the classified measurements from the unclassified output, producing an unclassified display that directly corresponds to the qualities of the classified object measured.